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Answers
P(x)=x³+6x²+3x+10
Sum of the roots ⇒ a+2b+a+a+b = -coefficient of x²/ coefficient of x³
⇒ 3a+3b = -(6)/1 = -6
⇒ 3(a+b) = -6
⇒ a+b = -2 --------- (1)
b = 2-a
Product of roots ⇒ (a+2b)(a+b)a = -constant/coefficient of x³
⇒ (a+b+b)(a+b)a = -10/1
Placing the value of a+b=2 in it
⇒ (2+b)(2)a = -10
⇒ (2+b)2a = -10
⇒ (2+2-a)2a = -10
⇒ (4-a)2a = -10
⇒ 4a-a² = -5
⇒ a²-4a-5 = 0
⇒ a²-5a+a-5 = 0
⇒ (a-5)(a+1) = 0
a-5 = 0 or a+1 = 0
a = 5 a = -1
a = 5, -1 in (1) a+b = -2
When a = 5, 5+b=-2 ⇒ b=-7
a = -1, -1+b=-2 ⇒ b=- 1
∴ If a=5 then b= -7
or
If a= -1 then b= -1
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